When does it all change?

I am loving that I can make my girls happy with such simple things now.

• The 10 year-old is thrilled to have me curl her hair for 10 minutes.
  
• The 7 year-old loves to read me a book in bed.
  
• The 4 year-old wants to climb on my lap after dinner. Every night. 

When do the requests for hair curling and book reading become cell phones and driver's licenses? How simple it would be to just remain like this, with three sweet girls who want to ride bikes, paint fingernails, and at the end of the day, climb on momma's lap.